Sectional scaffold frame



March 17, 1953 Filed Aug. 16, 1949 E. H. slMPsoN 2,631,900 sEcTIoNAL scAFFoLD FRAME 5 Sheets-Sheet 1 March 17, 1953 E. H. SIMPSON SECTIONAL. SCAFFOLD FRAME Filed Aug. 1e, 1949 5 Sheets-Sheet 2 IN VEN TOR.

March 17, 1953 H SIMPSON 2,631,900

SECTIONAL SCAFF'LD FRAME Filed Aug. 16, 1949 '5 Sheets-Sheet 5 Y n.) INVENTOR.

Patented Mar. 17, 1953 STATES oFFlcE SECTION AL SCAFFOLD FRAME Eugene H. Simpson, Milwaukee, Wis., assigner to Raymond J. Moths, Milwaukee, Wis.

4 Claims.

This invention relates to scaffolds and more particularly to a sectional scaffold.

It has been customary in the past to build scaffold towers in sections, each section comprising a pair of integral end frames connected by cross-braces. `:Such a scaffold is exemplified in the patent to Uecker, Patent No. 2,043,498, patented June 9, `1936, and subsequent patents by the same and other inventors. Of the scaffolds heretofore built on this principle, all scaffold end frames were the same width resulting in a rectangular tower. In such towers it is necessary that the scaffold be tied into the structure in order to prevent it being blown over by winds. f

It is an object of the present invention to provide a scaffold tower which will be more stable than those now being used.

Another object is to provide a scaifold tower which will more effectively resist wind pressures.

A further object is to provide a scaffold tower of sectional scaffolding which will be simple to erect and which will have high resistance to horizontal loadings.

A further object is to provide a scaffold end frame which will be simple to erect and which will, when erected according to this invention, present a high resistance to horizontal or wind loading.

Still further objects will become apparent upon considering the following specification, which, when considered with the accompanying drawings illustrates a preferred form of the invention.

In the drawings:

Fig. 1 is an elevational View of an end frame adapted for use in erecting a scaffold in accordance with this invention;

Fig. 2 is a detail sectional View of a corner of a scaffold frame, and is the corner shown in circle 2 of Figs. 1 and 3;

Fig. 3 is an end View of a scaiold tower constructed according to the present invention; and

Fig. 4 is an isometric projection of a portion of the scaffold shown in Fig. 3.

Referring to the drawings, the scaffold comprises a tower having a plurality of end frames of the general type shown in detail in Figs. 1 and 2. Referring particularly to those figures, it will be seen that the end frames comprises a pair of tubular posts JIJ-I parallel to each other, and when in use, vertical. The posts lll-J0 are joined adjacent their upper ends by a horizontal support |22 formed in three sections l2', l2" and A horizontal brace I4 is parallel to and 2 spaced from the horizontal support and may be fixed to the posts, as by welding, at its opposite ends.

Tubular stub-posts lil-li are xed, as by welding, to the lower horizontal brace l!! and project between the sections l2 and i12 and the sections l 2 and 12' of the upper horizontal support t2 and are joined integrally therebetween to provide a pair of vertical openings parallel to the posts which openings are adapted to receive coupling pins 38 (Fig. 2) which carry superposed end frames ic. VThe spacing of the stub-posts it-i6 is such as to aline with the posts of a superposed frame or such that the posts of a superposed frame will aline with one of the posts and one of the stub-posts on the lower frame.

Diagonal shear braces Ill-I8 and 2li-20 join the upper horizontal support l2 and the lower horizontal brace It and cooperate with a vertical brace 252 to absorb shear stresses between the two horizontal members.

Diagonal braces .2t-24 join the lower horizontal brace i6 adjacent the stub-posts IIE-'m6 with the posts illiu to transmit stress from the stub-posts lr6- I6 to the posts |0-I0,'and form stiieners for the posts.

Bolts 26 are Welded on the inner sides of the posts adjacentthe upper and lower ends thereof to receive the ends of cross braces to be described below. The cross braces are held on the bolts 26 by Wing nuts such as 28.

All members of the end frame just described except the wing nuts are joined together integrally by welding, or the like, to form a unitary structure.

Referring now to Fig. 4, a pair of end frames 3ll-3 are erected onr a plane horizontal surface defined by the lines p-p-p-p and are joined together by cross braces 32-'32. The cross braces, which may be pivoted together at their centers, are joined to the end frames through the bolts :26 and retained thereon by the wing nuts !2.8 to maintain the end frames vertica A second pair of end frames lSii-36 narrower than the frames 30-30 are superposed on the end frames 35i-30 so that one post of the frames 36 alines with a post I0 and the other post of the frames :315 alines with the stub-post +6 of the frames 30. Coupling pines 38 engage in the posts I0 or the stub-posts I6 to form the connection between the sections.

In a similar manner successively narrower frames may be superposed on each other to build a tapered tower of high stability. Such a tower is shown in Fig. 3, erected adjacent a wall, W.

For interior decorating the superposed end frames may be made to fit between the stubposts |6-I6 to give a scalold tapered from both sides.

The tapered towers thus described are strong and rigid and have a strong resistance to tipping forces.`

It will be realized that the hereinbefore described form of the invention is to be taken mere- 1y as a preferred embodiment thereof and that various changes in size, shape and arrangement of parts may be made without departing from the spirit of the invention or ther scope of the subjoined claims.

That which is claimed as new and is. desired to be secured by United States Letters Patent is:

1. A scalold end frame for use in a sectional scaold comprising, a pair of spaced parallel posts, a support comprising a plurality of integrally connected members joining said posts adjacent the upper ends thereof, said members including a stub-post mounted in said support and opening vertically therethrough parallel to and adjacent one of said posts, and a compression. brace joining the lower end of the stub post with the lower portion of one of the posts to transmit stress from said stub-post to said last mentioned post.

2. A scaffold frame for use in a sectional scaffold comprising, a pair of spaced vertical posts, a horizontal support comprising a plurality of integrally connected members joining said posts adf jacent the upper ends thereof, one of said members comprising a first stub-post mounted betweenV two members of said support and' integrally joined thereto and opening vertically through said support parallel to said posts and adjacent one of said posts, another of said members com- I prising a second stub-postmounted between two members of said support and opening verticallyV therethrough parallel tosaidposts and adjacent the other said post, and means including compression resisting shear braces to transmit stress from. said stub-posts to said posts,

3 A scaffold frame for use in. a sectional scaf'.-

fold, or the like, comprising, a pair of spaced n land. extendingupwardlybetween two of said members parallel with said posts, and opening upwardly therethrough and a diagonal compression brace joining the lower side of the horizontalpbrace adjacent the stub post with the lower portion of the post to transmit stress from the stub-post tov one of said posts.

Y 4. A scaold frame for use in a sectional scaffold comprising a pair of spaced parallel posts, a support comprising a plurality of members connecting said posts adjacent the upper ends thereof, at least one of said members including a stub post opening through the top of said support parallel to said posts, and a compression brace joining the lower end of the stub post with the lower portion of one of the posts to transmit stress from said stub post to the last mentioned post.

. EUGENE H. SIMPSON.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Francer Jan'. 5, 1936 

